Oscillators – With device responsive to external physical condition
Patent
1979-02-16
1980-12-23
Grimm, Siegfried H.
Oscillators
With device responsive to external physical condition
331151, 331167, 331181, H03K 3023
Patent
active
042413176
ABSTRACT:
The resistance-inductance element used to determine the frequency of the frequency generator in the prior art circuits is replaced by an inductance-capacitance combination. As in the prior art circuits the frequency determining circuit is connected between the output and the inverting input of an operational amplifier to whose direct input a reference voltage is applied. However in the present circuit an inductance is connected from the output to the inverting input of the operational amplifier and a capacitance-resistance circuit is connected in parallel with the inductance. A capacitance connects the inverting input of the operational amplifier to ground potential. Resistors connected from the inverting input to the positive voltage supply and to the output terminal from the inverting input and from the direct input are used to change the slope of the curve of frequency vs. inductance.
REFERENCES:
patent: 3732443 (1973-05-01), Lovrenich
patent: 3973191 (1976-08-01), Zabler
Grimm Siegfried H.
Robert & Bosch GmbH
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